St. Bartholomew's Church is one of the oldest church buildings in Ljubljana. The church was first mentioned in 1370, when in front of it a peace treaty between the Doge of Venice and Leopold III and Albert III of Habsburg was concluded by their representatives on 30 October 1370, in which the Austrians agreed to return the city of Trieste for the compensation of 75,000 florins.
In 1526, its valuables were donated to a fund for improving the city's defenses against Turkish attacks. In the end of 15th century and beginning of 16th, it was a venue of Protestant liturgy and was during Slovene anti-reformation in 1618, it was reclaimed as a Roman Catholic church. In 1825, it was damaged by fire and restored several times.
Some elements of the original Romanesque church have been preserved, among them the portal on the northern side. Between 1933-36, the church was partially redesigned according to plans by Jože Plečnik.
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Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.